Hi,

We have approved Augusts updates on monday. Since then all targeted systems CPU is peaking to 100% for 15-20 minutes on every "check for updates" interval... in our case every 2 hours. svchost (wuauserv service) and TrustedInstaller are the culprits.

I can already confirm the issue occurs on virtual machines (vmware), running a perfmon trace on a physical system now.

Anyone experiencing this issue also? Or any idea what might be causing this? I know it is normal behavior Windows checks for updates and the cpu peaks briefly but a peak of 20 minutes every interval doesn't seem normal to me.

Grts. 

• Edited by BallieWallie 17 hours 18 minutes ago

We are also experiencing the same issue as are others as noted in other threads in this forum.

https://social.technet.microsoft.com/Forums/windowsserver/en-US/8458ab49-9816-4717-8d72-8949477186af/check-for-updates-takes-30-minutes-on-windows-2008-r2-sp1-servers?forum=winserverwsus

https://social.technet.microsoft.com/Forums/windowsserver/en-US/77d7396f-6032-4f62-90ec-85bc55ac90f8/high-cpu-while-running-wuauctl-detectnow?forum=winserverwsus

We already have a case open with Microsoft.  I would recommend raising a case and in that explain others in the industry are having the same problem so it's not assumed it is limited to your environment.

If you have any feedback or solution please do post back.  I will do the same.

Isnt this a intended behavior?!

Looks like the client is updating his update list.

You could tweak your WSUS a little bit and removing superseeded updates etc.

Link

I experienced this behavior lots of times in the last company. 

I have set the "Automatic Updates detection frequency" to 22 hours thus limiting this behavior to once a day.

It is indeed intended behavior Windows updates his update list but the peaks in cpu usage we are having since the last rollout is not normal. We haven't had this issue before (see chart). 

Grts.